Hydraulic debarker



Feb. 26, 1952 J. E. HOLVECK ETAL HYDRAULIC DEBARKER Filed June 19,v 1948 6 Sheets-Sheet l JOSEPH E. HOLVECK ARTHUR G.ROCKWO0D IN V EN TORS File d June- 19, 1948' Feb. 26, 1952 J. E. HOLVECK ET AL 2,587,473

HYDRAULIC DEBPKRKER 6 Sheets-Sheet 2 IIZ JOSEPH E. HOLVECK ARTHUR G.ROCKWO0D INVENTORS BYM Feb. 26, 1952 J. E. HOLVECK ET-AL 7, 73

HYDRAULIC DEBARKER.

Filed June 19, 1948 G Sheets-Sheet 3 JOSEPH E. HOLVECK ARTHUR G. ROCKWOOD IN VEN TORS Feb. 1952 J. E. HOLVECK ET AL 255825473 HYDRAULIC DEBARKER Filed June 19, 1948 esneets-sheeu J'OSEPH E.HOLVECK ARTHUR G. ROCKWOOD IN V EN TQRS Feb. 26, 1952 J. E. HOLVECK ETAL HYDRAULIC DEBARKER 6 Sheets-Sheet 5 Filed June 19, 1948 J. E. HOLVECK ET AL Feb. 26, 1952 HYDRAULIC DEBARKER NOZZLE ADVANCE Filed June 19, 1948 ROTATING NOZZLE HEAD F l G. 12

NON-ROTATING- ROTATING NOZZLE HEAD FIG. I3

JOSEPH E. HOLVECK ARTHUR G. ROCKWOOD INVENTORS "logs; heretofore 'emproyedfis thatbfsupp the 10?; upon center's, ,much like theioen lethefi'otttingfthe'log on" these centers and ro fleeting afj'et of "high"velocityf'water agains the log tangentially?the"ciroumfefenoebfith 10g aft "which are "out ofroun d Patented Feb. 26, 1952 UNITED v e FF ICE;

ayne-some DEBARKER Joseph Holv Gi-Rockwood-yN ingtonfPunip an zisjom.

AppueefiBn J ne 1948;"seriafm: '34," 1 14- Tminvention relatest I f-the removal"o' batik from log's' and-"more paitiou'lerlya'to the ovl of'thei'b'erk by thigh velocityfjet'sof waterzind pendently of any; mechanieafassisting mean Heifetofore; methods and 'fippataltusfor fernq mg the berk 'from" logs heive-"been employee both by projecting a high 'velocityjet 'of water a' log'iperpendioulerlvi to the longitudinal 1 the log, movingftrieqjet ofxwateramngt the 0g and--iiide3ting-. or rotating' "the "log "one s pend J repeating-zthe operationT-thu-seiemevirigt inlorieitudinal increments. Thisfinetlfodremovalis relatively "slow' and" expensive several passes of the "jet'of water "are requlregi" to remove the mark from a'log;

Then; also," themeth'od"iand' apparatusgoffi emoving the; barl from logs" by, moving a' reg lcjn gitudinally *past one "'or" more nozzles 'proj'eoting high velocity water against i the" log'fhas been'ieme 'ployedl This-method has 'the"dlsidvdnt of high' "oonsumptioniof high 'vel'ooi ty waterfh '11 asthe fact that "theoperator is "unable to. I mine ixrhether the log "has'been" properlyiicleend of all 'bark and cambiumuntillthe entireflliag i'uis pessedthenozzles.

Still another method of removing the bank from" 'vide an' apparatus "for 1 removingfthe berk from logs? whi-clf apparatus is simple in constru'ction 1 -60 a log in a. minimum amount of timeiwi-tmsumirm the aid' of mechanical assistance-such as bymeans 'ivh'ich' u iil iffectively andicoinpletely'i-remove the batk reg-ardle'ss of limb sweetermerouniln'ess of the log. j 21 Moi-e specifically, the*-p esentinvention com- -"prises-aflog'deherkin -a' paiettus' which-employs the method- 3 Of 'movin'g I high velocity and "verticaljetof water irr the directionof the-longitudinal axis"bfe;horizontallypositioned log; with th'e w jet impinging in its greatest dimension; eplane parallel-'- to thelongitudinal axis of the ie -and mtatingeth'e 'iog: by means omen-tact rollers our ing the "longitudinal"movement of the' jet of high velocity Water to remove' the bark in substentially spiral increments and-tocompletely deberk the" log in one "pass of the-*j't of Water without of "grouters or "scorers" and? brushes or scouring means.

Another object 1 ofthe "invention is the provisidn 'of' a logv barking. apparatus' which embodies a. novel and "oomparatively:, gsimple structure-for supporting-the nozzle which projects thejet of high' velocitywaterand" 0f ipp'lying or delivering such water to'thenozzle.

Another object of the pfesentinventionis=the provision of a hydraulic debarking apparatus for logs which prc'wi'des meansfor variable'ba-rkin'g of efi'e'ctiveness: to meet'varieble con'clitions'o bark removal from logs. The resistance tobai'kingor removal of the 'bark froni logs variey'with the typeandiagelof me logs' thickness of the bark,

'jth'e season of the 'yeaij when the tree "w'a's'fcut, the-lapse of time betweenth'e cutting: of the*tree and the rmovei'bfftfie bark from the log as "vvell asothex? Iaictors,

More specifically, fine present" invention em- 'bodies me'ans -for' va'ryii'ig theang'le of iinffinge- -mentof.-achisel-likefljet of high pressure water with respect toe plane'passing through the longitudinalcenter-of a:---log--.and= means for varying the distance of the nozzle from-the legion-vary} 1 inggthe jet' acti'onby;-varying the mass and-veloc- 45 provide variable: barkinga effectiveness: as telbove refr red to With thes arid dti-lef objects in Vie'W,- asmay appear from the accompanying specifioition;the

invention consists of various features of eonstiuotlon' and combination" of"? parts}? which will beiflist described inconnection'withlthe"acconipanyingi rawings, showing' al hydfaiilio debariier -o-. a :'pize fem'eclform embodyingv ntion,

and the features formlngethelinvenbiglieviliibe mum oonsuniptionbt menweloeitytewatenandionerfi specifleailyjppinted outinthe claims.

Figure 6 is a vertical section taken on the line 6-6 of Figure 4.

Figure 7 is a detailed cross sectionitaken on line 1-1 of Figure 6.

Figure 8 is a detailed section of a control valve structure employed in the log debarking apparatus l Figure 9 is a vertical section through the nozzle proper employed in the debarking apparatus. Figure 10 is a vertical section throughthe nozzle taken at right angles to the view shown in Figure 9. I Figure 11 is a bottom plan of the nozzle; Figure 12 is a diagrammaticeviewshowing the inner section of the impingingpresstire water jet and resultant kerf on top of a log parallel w'ithla plane passing through the longitudinal section of alog. H

Figure. 13 is a View similar t o Figure 12 showing the resultant kerf on top of "a log at right angles with a plane passing through the longitudinal section of a.log. I Referring more particularly to the drawings,

the improved hydraulic log debarking apparatus [includes a plurality of log-turning or rotating rollers l arranged in parallel sets on suitable shafts}. The rollers I and shafts 2 are rotated from a suitable prime mover such as an electric ;motor "3 through suitablegearin'g' 4. "The logs,

. one of which is indicated in dotted linesat A in Figures 1 and 30f the drawings, are rolled laterally upon the rolls by any suitable type of mechanism (not shown) and are discharged laterally therefrom by any suitable type of mechanism [Knot shown) A supporting structure 5 is supported'above the "210g rotating rollers I and it has a pair of paral- .lelly extending tracks 6 carried thereby over which'thefla'nged wheels I of a nozzlecarriage .8 travels. The nozzle carriage 8 is moved longi- "tudinally on the rails 6 by means of any suitable propelling structuresuch as a cable 9 having its 'ends connected to opposite ends of the carriage 8. The cable 9 passes about suitable guide rollers II) which are rotated from a suitable prime mover II, such as an electric motor through a suitable set of gearing I2 or other power transmitting means was to move the carriage "8ba'ck and forth along-the rails -6 and move 'the carriage longitudinally of the axis of a log on the rotating and supporting rollers I; 7

The nozzlecarriage -8 has a cylinder l4 rigidly carried thereby and extending perpendicularly :to the carriage. A nozzle carrier I5 in the form of a hollow plungeris mounted in the cylinder I4 for reciprocatory movement. therein.

The portion of the cylinder I4 below the pack- -ing I6, through which the plunger I5 extends,

has an interiordiameter greater than, the exterior diameter of 'then'ozzle carrier I5, as clearly shown in Figure "6 of the drawings; and this lower portion'of the cylinder forms a manifold for high pressure'wat'er used for hydraulically removing bark from logs;

The high pressure water is delivered to the ure 4 of the "drawingsl able support 20.

coupling 24 to the inlet pipe which delivers the high pressure water into the manifold M. The couplings 22 and 24 are constructed to provide universal couplings which will permit universal movement of the conduits 23 and I9 relative to the inlet pipe 25 and coupling 2| without disrupting the flow of the high pressure water to the manifold. These universal couplings are provided to permit movement of. the. nozzle struc ture during the debark ing'o f' a log without impedance to the flow'of the high pressure water to the'nozzle. The universal couplings may be of any approved form, buta'fparticular construction of such'coupling shown infsection in Fig- The coupling 22 w hfis shown in section in Q'Figure 4 of the .diawings'coiiiprises'a pair oicylinders2fi and 21' disposed at right angles to each other, which cylinders have heads 28 attachedjto their ends in fluid tight connection; The conduits are connected to the ends or heads 28 0f the cylinders 26 Liners 29 are positioned in the cylinders 26 and are preferablythreaded to the heads 28 so that the water flowing out of the conduits I9 will fiow lfrom both'e'nds into the liner 29 and I -will flow out of this liner'29 through'a plurality of transversely e itending' outlet openings 30 position'ed intermediate the ends of theliner 29. The high pressure water flows from the openings 30 into a channel 3| formed in the wall of the cylinder and 'thenceintoa liner 32 in the cylinder 21. Theliner 32 identical in construction with the liner 29 and the water flowing fromthe channel 3| flows through the transverse openings in f the liner 32 and out the ends qftne liner into-the conduits 23.

By' provision IQf. .the coupling construction shown and just described the swivel joints of the pressure fluid delivering conduit structure will be hydraulically balanced, thus eliminating thrust on the swivel joints with the consequent wear'of their parts. The pressure of the waterfflowing through the conduit system is quite, highj(approximately twelve hundred pounds per square .inch) .and consequently without the hydraulically balanced couplings relatively great wear v on the partsof the swivel jfointswould insue.

""The, universal coupling 24 is of the same construction as the universal coupling 22, while the 'piv otali'coupling 2| is of the" same general construction, differing only in that it comprises but a single cylinder with a single liner therein; .It

, is understood, course, that the'heads 2a of" the various couplings are rotatable relative to'the cylinders so as to permit universal movement of the various conduit. sections.

The nozzle carrier I5 is hollow, as clearly shown at B in Figure 6 of the drawings, andit has a transversely extending wall 34 ,for me d therein intermediate its ends to securely dividethe lower section'of the plunger-like carrier I5 from the upper section.

partition skis providedwith a -pluralityeot 'transversel' y extending-openings which establishes communication between the hollowinterior-- of the lower :portion ofthe nozzle carrier IS with the manifold I I so as to perinit the high 'p'ressure water to flow from the manifold into the nozzle carrier and i'outwardlyi therefrom through the nozzle: head-3s carried bythelower end ofthe nozzle-carrier; i Y

Theznozzle carrier l5is mountediforboth recip roc'atoryand rotary movement in the cylinder I 4 #and it is packed at' suitable": desirable po'in ts in nozzle 36, and the" raising and lowering of the nozzle is controlled by a solenoid actuated valve structure 39'. v 1 H Wlienitis' desired to lower the nozzle structure the solenoid; actuated valve-structure 39 is open etted,- through operation of aiso'lenoid (see Fig- 'ifiesand: smofxtne drawings 1- to permit high pressure-water tofiow through 'a conduit "4| into a valve housing" 42,-: past a valve 43, which moved to its open position at such time and into andthrough a conduit '44 Which-"delivers Ithe' high pressure water-intoan annular chamber about "the up'per portion of the nozzle carrier 15. The high pressure Water delivered into the chamber 45 passes through a plurality ot'passages 45 into a-space 4511- and againsta head 45 carried by the upper end ofthe nozzle carrierl 5. The head 46 has a greater area subjected .to the pressure" of the hig'hpressure water'thanthe area of theshoulder 38 sothatthe highpressure waterx'acting .upon the'head-46'will overcome the pressure-of the high pressure water acting on the-shoulder. 38 and will move the nozzle carrier-I5 andrnozzle. 36 downwardly. By control of the valvez39 such movement may be arrestedat any point within the-range of movement of the nozzle carrierand nozzle. Whenit. is 'des'ired to raise the nozzle the waive-structure 39 is"operated to seat the valve '43 'and' cut off the now of high pressure water to the annularchamber 45;"and a val-veil is opened at the same time, by means of 'itssolenoid 41 to allow pressure fluid from the chamber 45 to flow through a pipe 41a outwardly through an exhaust c'on'duit'49, thus relieving the pressure" against the head- 46 and permitting the pressure of the high pressure-:fluidagainst the shoulder 38 150 move the .nozzle into its-upward. position. By control- 0f the .valve structures .39 and 41 they "leed ingoff of the pressurelfiuidirom the chamber 45 may be controlled and when both valves 39 and 41 are closedthe nozzle will be held-in any adjusted. position within its range of movement.

:Thus the-nozzle 36may be=adjusted radiallyof the axis of Jaslogtcarried by or mounted upon the supporting and rotating rollers l and the distance between thenozzle 36 and the log maybevaried to suit particular conditions'met with in debarking particular types oflo'gs; as-wellas adjusted to regulate the distance from the log in accordtime with the *di'ameter'of the *log" so as "to be certain"toobtainthe-desired'erosive actionpf the 6 jet or' iets ot high pressure water prolectedifrom thenozzle'36" onto-the log;

The resistance to barking or the removalof bark from logs varies with the type and-age of the log or timberpth'ickness of the bark, season of the year when the log was cut -the-time be- I tween cutting and removal of the bark and a number of other factors, The contributing factors efiectin-g the hydraulic removal" of the bark -from the logs may vary with each log and.-- consequently, quick -adiustment of the-nozzle head for the requiredidegreeof debarkin'g is desirable. To provide :such vquick adjustment of v the nozzle head, means is provided in the present invention for rotating the nozzle head 36 and-the nozzle carrier: l5-relative to the cylinder l4 and fconsequently, relative to the' nozzle carriage 8, which rotary adjustment 'of the nozzle head cooperates with thefadjustment provided by means or the pressure differentiatareas" on the nozzle carrier as above-described.

Various structures may be provided tor -rotat- 'ing the nozzle head 36 i without departingtfi om the function of-the present inventicm-andone structure for providing such rotation is illustr'atedin the drawings; butitis to be'und'ers'tood that-the invention not to be limited 'to--the specific mechanism" illustrated for rotating the nozzle, but" onlyby the scope of the pendant claims.

In the form of nozzle"rotating means sh'owii 'in Figures-5 anclq of the drawings, thehead 46 0! thenozzle carrier |5 has an: opening whore-=50 extending 'longitudinally therethrou'gh lfi:'-Whidh a fiat key 51 is positioned.v A rod- 52 extends longitudinally through the opening 50 and downwardly 'into the upper hollow portion of the nozzle carrier I 5a distance corresponding to' the length of movement of the nozzle carrier l5 rel'atime to the cylinder 14. Therod'52 has a: flat side 53 which: engages against theikey 5| so that when the rod 52 is-rotated the nozzle carrier 15 will be correspondingly rotated.

The rod 52 passes outwardly: through: ahead 54-of the' cylinder l4," being. packed by suitable packing wherever necessary to. prevent leakage of high pressure water: thereby. The protruding end of the rod 52 has a crank arm 55 connected theretowhich isrconnected through a series "of armsor=levers-56 to a scotch yoke structure: 51:.

The scotch' yoke structure 51: includes a block 58 to which the endilever of the linkage :connec. tion .iscpivoted. The block 58 slides-transversely or laterally ,in a secondblock 59. The block-59 slides inca'suitable guideway 60 in.-a direction 55 transverselyv to the direction of movement of the'block58. The block 59 is connected byx-a piston: rod 6| to a piston 62' which reciprocates in: a: cylinder: 63.

The. piston 62 is reciprocatedin the cylinder 6 63 under action of the high. pressure water-and under control of a solenoid actuated valve-- =65, which may be of the same construction as the solenoid actuatedvalve 39 ishown 1 in detail ,in

Figure 80f thedrawings.

A water supply conduiti 6 is shown in I Figure 4 of the drawings as connected to the inlet-pipe 25, -.but-it may be connected at any other suitable pointsin thesupply line of high pressure water. The conduit 66 opens into thecylinder 70 63 ontheside of the piston 62 to which the piston stem or rod 6| visconnected, and when the valve is operated to position to hold the nozzle 36 in such manner that the fiat side of 'th'e jetof water. issuing therefrom" will be-parallehtom 7o vertic'aiplane passirigthroixgh the axis-of alog position in the cylinder 63.

- 7 on the supporting rollers, the pressure fluid acting on the piston 62 will force it to its outward A supply line 61 for pressure water to the cylinder back or outwardly of the piston 62 is connected to the supply conduit 66 and passes through the valve structure 65, and a second communicating conduit 68 in the cylinder so that when the valve 65 is operated to rotate the nozzle 36 pressure water will be admitted into the cylinder 63 back of the pistonf62. Due to the difference in the area of the ends of the piston acted upon by the high pressure water, caused by the piston rod Bl, the piston :62 will then be forced inwardly against the pressure of the fluid in the inner end of the cylinder and operate the scotch yoke structure for rotating the rod 52 and, consequently, rotating the nozzle carrier l5 and nozzle head 36. When a solenoid operated valve structure 65 is operated to open the conduit 68 in the outer end of the cylinder 63 to an exhaust line 69 the pressure in the cylinder 63 behind the piston 62 will be lower than the pressure inwardly of the piston 62 so that the piston will be forced outwardly to cause rotation of the rod 52, nozzle carrier l5 and nozzle head 36 in a reverse direction. When both valves 65 and B5 are closed the nozzle will be held locked in its adjusted position.

The nozzle head structure 36 is shown in detail in Figures 9 to 11 of the drawings and it comprises a body which is attached in any suitable manner (not shown) to the lower end of the nozzle carrier l5. A nozzle attaching plate I I' is attached to the lower outer end of the body 10 in any suitable manner such as by bolts 12 and it carries a nozzle element 13. In Figures 9 to 11 of the drawings the nozzle element 13 is shown as an elongated plate having two outlet openings M therein separated by a suitable partition 15. These nozzle openings 14 are shaped so as to project a thin fiat chisel-like stream of water against the surface of a log on the supporting and rotating rollers I so as to provide the maximum erosive action of the jets of high pressure water for removing the bark from the logs. The nozzle attaching plate H is provided with a suitable opening 16 of such size and shape as to prevent interference with the shape of the jets of water projected from the nozzle 13 and the housing 10 of the nozzle head is provided with (F a passage 'l'l so as to permit free, unimpeded flow of the water to the nozzle 13. The cross-section dimensions of the passages 11 gradually change between its inlet and outlet ends, the length increasing and the width decreasing at such rates, that the area in cross-section of passage 11 preferably decreases as the plane of cross-section approaches the outlet end. If it is so desired, the nozzle 13 may have a single opening therein or any desired number of openings, two openings '14 being shown as an example.

As'will be noted from the drawings and the above description, the nozzle carrier is rigidly carried by the nozzle carriage 8, and is perpendicular to the line of travel of the nozzle carriage 8 at all times, and the pressure water flows ini'a relatively long straight path from the entrance openings of the nozzle carrier I5 to the nozzle 36. Thus, at all adjustments of the nozzle 36 and its carrier I5 relative to a log, there are no bends or tortuous ways in the flow path to set up Teddies in the water, and to produce the undesir- Iable results always occasioned by eddies in the flow of high pressure water.

As above stated, the resistance to barking or removing the bark from logs varies due to a number of factors, and the contributing factors afiecting the hydraulic removal of bark from logs may vary with each log, requiring quick adjustment of the nozzle head, and the above described structures which permit both rotary movement of the nozzle and movement of the nozzle in a plane substantially parallel to a plane passing through the axis of a log on the supporting and rotating rollers will permit of such quick adjustment and affords means for eliminating over-barking, undue splintering of the log, and the corresponding loss of wood.

Basically, the removal of bark from logs with the present hydraulic debarker is brought about by erosion through the effect of the impinging force or jet action of the water at high velocity applied on a confined area of the bark surface. The jet action may be taken generally to vary as the product of .mass and velocity. These two components are also expressed by the gallons per minute flow of pressure water per unit width of barking kerf (representing mass) and the square root of the orifice pressure of the nozzle in pounds per square inch (representing velocity). Through the application of this basic principle an economical variation in the barking intensity is accomplished by varying the gallons per inch flow at constant pressure and constant gallons per minute supply of high pressure water. This is provided for by the rotation of the nozzle head which by angular positioning of the impinging jet varies the component mass or its equivalent gallons per inch of cutting kerf.

This is illustrated in Figures 12 and 13.

Figure 12 in the diagrammatic plan view thereof for rotative barking, that is wherein the log is rotated and the nozzle moved longitudinally along the log as in the present invention, and shows the inner section of the impinging jet and resultant cutting kerf on top of the log parallel with a plane passing through the longitudinal center of the log. The log is rotated by the rotating supporting rollers I and at the same time the jet of high pressure water is advanced longitudinally through the length of the log at a constant rate in increments of the dimension h per each revolution of the log. The jet of high pressure-water may be rotated in either direction as indicated by the arrows and positioned at any angle g as at a, b, c, or ,f for varying the barking kerfs 1h. The length of the barking kerf it varies as the cosine of the angle 9 and determines the degree of barking or removal of the bark from the log. Complete removal of the bark from the log is accomplished in each complete stroke or movement of the jet throughout the length of the log.

Figure 13 shows the nozzle head for longitudio nal barking of non-rotating logs, the nozzle head having been rotated 90 from its Figure 12 initial position or at right angles to a plane extending through the longitudinal center of the log in which it has minimum barking value, and is usable particularly on logs having tight bark difficult of removal. Variable intensity of the debarking jet is obtained in the same manner as disclosed and referred to in Figure 12 with the exception that the degree of bark removal in- ";o creases as the nozzle moves towards a position where the flat side of the jet will be parallel to a plane extending through the longitudinal axis of the log. a

The control of the jet just described precludes 1'5 the necessity of applyingother means such as changing Water pressure responding results. I, I r

' It'will be understood that the invention is not to be limited to 'the specific construction or arrangement of parts shown, but that theymay; be widely modified within the invention definedby the'claims} What is claimed is:-

"1'. 'In an apparatus fer hydraulically} debark ing logs, a carriage for-- movement along a log to be debarked, a cylinder carried by said carindependently of the cylinder, a transverse par-' tition in said nozzlecarrier forming ailower pressure fluid passage and an upper space cutoff from said fluid passage, means for rotating said nozzle carrier extending into saidv upper space, a' nozzle carried by the lower end of the. nozzle carrier, said' nozzle carrier having openings therein near sa'id' partition to admit pressure fluid from said manifold into said'fluid passage, anozzle carried by the lower end of said nozzle carrierand means for moving said nozzle carrier longitudinally and rotatably independently of said manifold. v

-2.- An apparatus for hydraulically debarking logs as:- claimed in claim 1 wherein said means for rotating said nozzle carrier consists of a. rod having a flat thereon, a head on the upper end of said nozzle carrier having an opening therein provided with a flat for engagement with the flat of said rod, said rod slidable in said opening, and means for rotating said rod to rotate the nozzle carrier.

3. An apparatus for hydraulically debarking logs as claimed in claim 1 wherein said means for rotating said nozzle carrier consists of a rod having a flat thereon, a head on the upper end of said nozzle carrier having an opening therein provided with a flat for engagement with the flat of said rod, said rod slidable in said opening, pressure fluid actuated means for rotating said rod, conduits connecting said pressure fluid actuated means to said pressure fluid delivery means, and a valve for controlling delivery of pressure fluid to said pressure fluid actuated means. v

4. An apparatus for hydraulically debarking logs as claimed in claim 1 wherein said nozzle is constructed to project a relatively thin flat chisel-like stream of fluid against a log to be debarked, said nozzle rigidly carried by said nozzle carrier to project the pressure fluid stream substantially axially of the carrier at all times, whereby movement of the carrier will vary the debarking intensity of a jet of fluid projected by the nozzle.

5. In an apparatus for hydraulically debarking logs, a carriage for movement along a log to be debarked, a cylinder carried by said carriage, the lower portion of said cylinder forming a manifold for debarking pressure fluid, means for delivering fluid under pressure to said manifold, a hollow nozzle carrier mounted in said cylinder for longitudinal and rotary movement independently of the cylinder, a nozzle carried by the lower end of said nozzle carrier, said nozzle carrier having openings therein to permit pressure fluid to: enter the nozzle carrier from said manifold,-means for rotating said or gallonsv per minute, of high pressure .waterfsupply to obtain-con nozzle, means 'for moving said nozzle carrier longitudinally independently of the manifold,

said nozzle being constructed to project a relatively thin flat chisel-like stream of fluid against a log to be debarked, said nozzle rigidly carried by said nozzle carrier to project the pressurefluid stream substantially axially of the carrier at all times whereby movement of the carrier will vary the debarking intensity of a jet of debarking fluid projected by the nozzle.

6. In an apparatus for hydraulically debarking logs, a carriage for movement along a log to be debarked, a cylinder carried by said carriage, the lower portion of said cylinder form ing a manifold for debarking pressure fluid, means for delivering fluid under pressure to said manifold, a hollow nozzle carrier mounted in said cylinder forlongitudinaland rotary movement independently of the cylinder, a nozzle carried by the lower end of said nozzle carrier, said nozzle carrier having openings therein to permit pressure fluid to enter the nozzle car-' rier from-said manifold, means for rotating said nozzle, means for moving said nozzle carrier .longitudinally independently of the, manifold, said nozzle being constructedto project a relativelythin flat chisel-like stream of fluid against a log'to' be debarked, said nozzle rigidly carriedv by said nozzle carrier to project the pressure fluid stream substantially axially of the carrier at all times whereby said means for rotating the nozzle together with said means for moving the nozzle carrier longitudinally will vary the position of the nozzle relative to a log to be debarked to vary the mass and velocity of a jet of water projected by the nozzle against a predetermined area of surface of a log for varying the erosive action of a pressure fluid jet on a log.

7. In an apparatus for hydraulically debarking logs, a carriage for movement along a log to be debarked, a cylinder carried by said carriage, the lower portion of said cylinder forming a manifold for debarking pressure fluid, means for delivering fluid under pressure to said manifold, a hollow nozzle carrier mounted in said cylinder' for longitudinal and rotary movement independently of the cylinder, an annular shoulder formed on said nozzle carrier intermediate its ends and exposed to pressure of fluid in said manifold for urging said nozzle carrier upwardly relative to the manifold, a head formed upon the upper end of said nozzle carrier and having greater cross sectional area than said shoulder, means for delivering pressure fluid from said pressure fluid delivery means against said head to move said nozzle carrier downwardly against the pressure exerted against said shoulder, and a valve for controlling delivery of pressure fluid against said head.

8. An apparatus for hydraulically debarking logs as claimed in claim '7 including hydraulically operated means for rotating said vnozzle carrier, means for delivering pressure fluid from said pressure fluid delivery means to said hydraulic means and a valve for controlling delivery of pressure fluid to said hydraulic means.

9. Apparatus for hydraulically debarking logs as claimed in claim 7 including a nozzle rigidly carried by the lower end of said nozzle carrier, said nozzle constructed to project a relatively thin flat chisel-like stream of fluid against a log to be debarked whereby movement of the carrier would vary the debarking intensity of a 5 jet of debarking fluid projected by the nozzle.

- 10. An apparatus for hydraulically clebarking; logs as claimed in claim 7 including hydraulicallyj frorn'the nozzle-will always be projected parallel to -the longitudinal axis'ofithe nozzle carrier,

carrier-longitudinally will vary the position i the nozzle relative to a log to be debarked tovary the mass and velocity of a jet of water projected by the nozzle against a predetermined area of surface of alog for varying the corrosive action of the jet on a log.

11. Apparatus for hydraulically debarking logs as claimed in claim '7 including a nozzle rigidly carried by the lower end of said nozzle carrier and having an elongated; relatively narrow outletopening therein arranged so that water projectedfrom the nozzle will always be projected parallel to the longitudinal axis of the nozzle carrier, means for rotating saidnozzle carrier to varyithe angle at which the thin chisel-like strearn'ibf water projected from said nozzle will strike a log to be debarked at difierent angles relative to the longitudinal axis of the log. 1'

12. Apparatus for hydraulically debarking logs as claimed in claim .7 including a nozzle rigidly carried by the lower end of said nozzle carrier and having an elongated relatively narrow outlet opening therein arranged so that water projected Number means for rotating said nozzle carrier to vary the :angle at which the thin chisel-like stream of water projected from said nozzle will strike a log to be debarked atidifierent angles relative to the-longitudinal axis of the log, said rotating means comprising hydraulically operated means connected to the nozzle carrier, means for delivering pressure fluid to said hydraulic means and a valve for controlling delivery of pressure fluid; to said hydraulic means.

. JOSEPH 'E. HOLVECK.

ARTHUR G. ROCKWOOD,

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